myTestBook.com Math Reading Science Practice Test for Grade 1, 2, 3, 4 & 5    
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Grade: 8,    Subject: Math,    Topic: Number and Number Sense Scientific Notation Add, Subtract, Multiply and Divide
Question 1:
5.67 × 10 7   +   7.34 × 10 7   =   ?

13.0 × 10 813.01 × 10 14

1.301 × 10 81.301 × 10 7
 
Question 2:
8.548 × 10 15   −   2.224 × 10 15   =   ?

6.324 × 10 155.324 × 10 15

6,324 × 10 146.024 × 10 0
 
Question 3:
(4 × 10 4)    ×    (2 × 10 3)   =  ?

8 × 10 76 × 10 7

8 × 10 128 × 10 1
 
Question 4:
(6 × 10 5)   ÷   (2 × 10 2)   =  ?

8 × 10 53 × 10 10

3 × 10 2.53 × 10 3
 
Question 5:
2.55 × 10 7  +  50,000,000   =   ?

7.55 × 10 73.05 × 10 7

2.555 × 10 72.60 × 10 7
 
Question 6:
2.55 × 10 7   −  10,000,000   =  ?

2.551 × 10 71.55 × 10 7

2.54 × 10 72.45 × 10 7
 
Question 7:
(4 × 10 4)   ×   1,000   =   ?

4 × 10 7400 × 10 7

4 × 10 84 × 10 6
 
Question 8:
(8.4 × 10 8)   ÷   10,000   =   ?

8.0 × 10 84.4 × 10 8

8.4 × 10 48.4 × 10 2
 
Question 9:
Weight of the Earth is 5.9736 × 10 24 Kg. Mass of the Venus is 4.8685 × 10 24 Kg. What is the combined weight of the Earth and Venus?

10.8421 × 10 26 Kg10.8421 × 10 23 Kg

1.08421 × 10 25 Kg10.8421 × 10 25 Kg
 
Question 10:
Planet Venus is 1.08 × 10 8 Km away from the Sun and Planet Mercury is 5.79 × 10 7 Km from the Sun. How much farther away is the planet Venus from the Sun as compared to the planet Mercury?

6.21 × 10 7 Km5.01 × 10 8 Km

5.10 × 10 7 Km5.01 × 10 7 Km
 
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